Abstract
Statement of problem
Endocrowns have been reported to be successful restorations for endodontically treated
molars. However, comparisons between maxillary and mandibular molars, with different
pulp chamber configurations are lacking. Information on the influence of venting on
the adaptation of endocrowns is also lacking.
Purpose
The purpose of this in vitro study was to evaluate the adaptation of endocrowns in
maxillary and mandibular molars by means of microcomputed tomography (μCT).
Material and methods
Mandibular and maxillary first molars were divided into 4 groups (n=10): ManE: mandibular
endocrown; ModManE: modified mandibular endocrown; MaxE: maxillary endocrown; and
ModMaxE: modified maxillary endocrown. Endocrowns were produced by using computer-aided
design and computer-aided manufacture (CAD-CAM). Modification was carried out on the
part of the endocrown that extended into the pulp chamber by preparing vents. The
specimens were cemented and scanned by using μCT, the images reconstructed, and the
internal and marginal adaptation examined. Statistical analyses were performed by
using a 3-way ANOVA, 2-way ANOVA, and the independent samples t test (α=.05).
Results
ManE displayed better mean ±standard deviation internal adaptation (182 ±59 μm) than
MaxE (215 ±55 μm) (P<.01). Regardless of the groups, the pulpal floor was the area with the poorest fit
(P<.001). The marginal gap of mandibular molars (91 ±20 μm) was lower than that of maxillary
molars (110 ±26 μm) (P<.05). The effect of modifying endocrowns on the marginal gap was not found to be
statistically significant (P>.05).
Conclusions
Internal and marginal adaptation of endocrowns differ between maxillary and mandibular
molars.
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe to Journal of Prosthetic DentistryAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
References
- The endocrown: an alternative approach for restoring extensively damaged molars.J Esthet Restor Dent. 2013; 25: 383-390
- Fabrication of a metal-free ceramic restoration utilizing the monobloc technique.Pract Periodontics Aesthet Dent. 1995; 7: 83-94
- Clinical evaluation of adhesively placed Cerec endo-crowns after 2 years--preliminary results.J Adhes Dent. 1999; 1: 255-265
- Assessment of marginal adaptation and fracture resistance of endocrown restorations utilizing different machinable blocks subjected to thermomechanical aging.J Esthet Restor Dent. 2018; 30: 319-328
- Restoration of severely damaged endodontically treated premolars: the influence of the endo-core length on marginal integrity and fatigue resistance of lithium disilicate CAD-CAM ceramic endocrowns.J Dent. 2018; 68: 41-50
- Endocrowns: a systematic review.J Prosthet Dent. 2020; 123: 411-418
- Comparison of fracture strength of endocrowns and glass fiber post-retained conventional crowns.Oper Dent. 2012; 37: 130-136
- An investigation of dental luting cement solubility as a function of the marginal gap.J Prosthet Dent. 1991; 65: 436-442
- Evaluation of marginal and internal adaptation of hybrid and nanoceramic systems with microcomputed tomography: an in vitro study.J Prosthet Dent. 2017; 118: 200-207
- Influence of marginal fit and cement types on microleakage of all-ceramic crown systems.Braz Oral Res. 2011; 25: 261-266
- Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures.Eur J Oral Sci. 2008; 116: 272-279
- Evaluation of the marginal and internal discrepancies of CAD-CAM endocrowns with different cavity depths: an in vitro study.J Prosthet Dent. 2017; 117: 109-115
- 3D micro-CT analysis of void formations and push-out bonding strength of resin cements used for fiber post cementation.J Adv Prosthodont. 2016; 8: 101-109
- Internal fit of lithium disilicate and resin nano-ceramic endocrowns with different preparation designs.Futur Dent J. 2017; 3: 67-72
- Effect of preparation depth on the marginal and internal adaptation of computer-aided design/computer-assisted manufacture endocrowns.Oper Dent. 2016; 41: 607-616
- Comparative evaluation of the internal and marginal adaptations of CAD/CAM endocrowns and crowns fabricated from three different materials.Int J Prosthodont. 2021; 34: 341-347
- Effect of different CAD-CAM materials on the marginal and internal adaptation of endocrown restorations: an in vitro study.J Prosthet Dent. 2020; 123: 128-134
- Three-dimensional digital evaluation of the fit of endocrowns fabricated from different CAD/CAM materials.J Prosthodont. 2019; 28: e504-e509
- The influence of FRCs reinforcement on marginal adaptation of CAD/CAM composite resin endocrowns after simulated fatigue loading.Odontology. 2016; 104: 220-232
- Anatomy of the pulp chamber floor of the permanent maxillary first molar.J Endod. 1978; 4: 214-219
- An analysis of the effect of a vent hole on excess cement expressed at the crown-abutment margin for cement-retained implant crowns.J Prosthodont. 2009; 18: 54-59
- Effect of venting on cast gold full crowns.J Prosthet Dent. 1971; 26: 621-626
- Determination of the minimum number of marginal gap measurements required for practical in vitro testing.J Prosthet Dent. 2000; 83: 40-49
- Marginal adaptation of fixed prosthodontics: a new in vitro 360-degree external examination procedure.Int J Prosthodont. 2004; 17: 218-223
- The estimation of cement film thickness by an in vivo technique.Br Dent J. 1971; 131: 107-111
Article info
Publication history
Published online: January 13, 2021
Footnotes
Supported by Ondokuz Mayıs University Research Fund, grant #1904.17.020.
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
